EP0823578B1 - Rohrkupplung aus synthetischem Harz - Google Patents

Rohrkupplung aus synthetischem Harz Download PDF

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Publication number
EP0823578B1
EP0823578B1 EP97112652A EP97112652A EP0823578B1 EP 0823578 B1 EP0823578 B1 EP 0823578B1 EP 97112652 A EP97112652 A EP 97112652A EP 97112652 A EP97112652 A EP 97112652A EP 0823578 B1 EP0823578 B1 EP 0823578B1
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EP
European Patent Office
Prior art keywords
face
pipe
diameter
secondary seal
indicated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP97112652A
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English (en)
French (fr)
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EP0823578A3 (de
EP0823578A2 (de
Inventor
Kiyoshi c/o Nippon Pillar Packing Co. Ltd Nishio
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Nippon Pillar Packing Co Ltd
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Nippon Pillar Packing Co Ltd
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Application filed by Nippon Pillar Packing Co Ltd filed Critical Nippon Pillar Packing Co Ltd
Publication of EP0823578A2 publication Critical patent/EP0823578A2/de
Publication of EP0823578A3 publication Critical patent/EP0823578A3/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
    • F16L19/041—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection the ring being an insert
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe
    • F16L47/041—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe the plastic pipe end being flared either before or during the making of the connection

Definitions

  • the present invention relates to a pipe joint made of resin, and particularly to a pipe joint made of resin which is used in piping for a liquid having high purity or ultrapure water to be handled in a production process of various fields such as production of semiconductor devices, production of medical equipment and medicines, food processing, and chemical industry.
  • a pipe joint made of resin shown in Fig. 8 comprises a joint body 81, an inner ring 82, and a pressing ring 83.
  • the joint body 81 comprises a pipe receiving port 84, a tapered primary seal receiving face 85, and a tapered secondary seal receiving face 86 which is formed at the tip end of the pipe receiving port 84.
  • An external thread portion 87 is formed on the outer periphery of the pipe receiving port 84.
  • the inner ring 82 comprises a connecting portion 89 having a bulge portion 88 of a mountain-like section shape, and a projected portion 90.
  • a tapered primary seal urging face 91 is formed at the tip end of the projected portion 90.
  • the pressing ring 83 comprises a pressing piece 92.
  • one end of a pipe made of resin 7 which is pressingly inserted into the connecting portion 89 is increased in diameter and a tapered secondary seal urging face 93 is formed on the outer peripheral face of the pipe 7.
  • the inner ring 82 having the connecting portion 89 to which one end of the pipe 7 is connected by the press insertion is inserted into the pipe receiving port 84 of the joint body 81.
  • An internal thread portion 94 of the pressing ring 83 which is previously fitted onto the pipe 7 is screwed on the external thread portion 87 of the pipe receiving port 84, and then fastened.
  • the pressing piece 92 of the pressing ring 83 presses the inner ring 82 in the insertion direction.
  • a pipe joint made of resin shown in Fig. 9 comprises a joint body 95, an outer ring 96, and a pressing ring 97.
  • the joint body 95 comprises a pipe receiving port 98, and a tapered seal receiving face 99 which is formed at the tip end of the pipe receiving port 98.
  • An external thread portion 101 is formed on the outer periphery of the pipe receiving port 98.
  • the outer ring 96 comprises a tapered seal urging face 102 which is formed at the tip end of the ring.
  • the outer ring 96 is pressingly fitted onto the outside of one end of a pipe made of resin 7, thereby joining the outer ring 96 to the one end of the pipe 7.
  • the one end of the pipe 7 which is projected from the outer ring 96 in this way is inserted into the pipe receiving port 98, and the seal urging face 102 of the outer ring 96 is pressed against the seal receiving face 99 of the pipe receiving port 98.
  • An internal thread portion 103 of the pressing ring 97 is screwed on the external thread portion 101 of the pipe receiving port 98, and then fastened.
  • the seal urging face 102 of the outer ring 96 which is pressed by the pressing ring 97 is pressingly contacted with the seal receiving face 99 of the pipe receiving port 98, thereby providing the contacting area with a sealing ability.
  • a pipe joint made of resin shown in Fig. 10 comprises a joint body 104, an inner ring 105, and a pressing ring 106.
  • the joint body 104 comprises a pipe receiving port 107 which is formed at one end in the axial direction, and a tapered seal receiving face 108 which is formed at the tip end of the pipe receiving port 107.
  • An external thread portion 109 is formed on the outer periphery of the pipe receiving port 107.
  • the inner ring 105 is formed so as to have a mountain-like section shape.
  • one end of a pipe made of resin 7 into which the inner ring 105 is pressingly inserted is increased in diameter and a tapered seal urging face 110 is formed on the outer peripheral face of the pipe 7.
  • One end of the pipe 7 into which the inner ring 105 is pressingly inserted is inserted into the pipe receiving port 107.
  • the internal thread portion 112 of the pressing ring 106 which is previously fitted onto the pipe 7 is screwed on the external thread portion 109 of the pipe receiving port 107, and then fastened.
  • the pressing piece 106 presses the pipe 7 and the inner ring 105 in the insertion direction. This causes the seal urging face 110 of the pipe 7 to be pressingly contacted with the seal receiving face 108 of the pipe receiving port 107, thereby providing the contacting area with a sealing ability.
  • the fastening amount of the pressing ring 83, 97, or 106, the fastening torque, and the like must be controlled highly accurately so that the fastening force of the pressing ring 83, 97, or 106 is strictly set to be a predetermined degree. This produces a problem in that a connecting operation requires high skill and experience.
  • the present invention has been conducted in view of the above-mentioned circumstances.
  • the pipe joint made of resin of the invention comprises the following elements:
  • the projected portion of the inner ring which is connected to a pipe made of resin by pressingly inserting the connecting portion into the pipe is inserted into the pipe receiving port of the joint body, and the pressing ring which is previously fitted onto the pipe is screwed on the pipe receiving port and fastened.
  • the projected cylindrical portion of the inner ring is pressingly inserted into the annular groove of the joint body, and the primary seal urging face of the inner ring is pressingly contacted with the primary seal receiving face of the cylindrical portion. Therefore, a seal contact pressure in the axial direction is generated in the pressingly contacting area (primary sealing portion) between the primary seal receiving face and the primary seal urging face, thereby primarily ensuring the sealing performance.
  • the secondary inner urging face is pressingly contacted with the secondary inner receiving face
  • the secondary outer urging face is pressingly contacted with the secondary outer receiving face. Therefore, a seal contact pressure in a radial direction is generated in the pressingly contacting area (secondary sealing portion), thereby secondarily ensuring the sealing performance.
  • a seal contact pressure is generated at two areas in different directions, i.e., the axial and radial directions, and a double sealing portion is formed by the primary and secondary sealing portions.
  • the primary seal receiving face which is formed in a flaringly tapered manner on the inner peripheral portion of the tip end of the cylindrical portion of the joint body overlaps with the primary seal urging face of the inner ring, from the outer side in a radial direction.
  • the connecting portion of the inner ring comprises a bulge portion which has a mountain-like section shape, and which increases a diameter of the pipe into which the connecting portion is pressingly inserted, thereby forming a tertiary seal urging face and a pressure receiving face on an outer peripheral face of the pipe, the tertiary seal urging face having a tapered shape in which a diameter is reduced as moving toward a tip end of the pipe, the pressure receiving face having a tapered shape in which a diameter is increased as moving toward the tip end of the pipe, a tertiary seal receiving face which is formed in a flaringly tapered manner and with which the tertiary seal urging face is pressingly contacted is formed at a tip end of the pipe receiving port, and an inner peripheral end of the pressing portion is formed into an annular edge which abuts against the pressure receiving face and which applies the pressing force in the insertion direction to the pressure receiving face.
  • the annular edge of the pressing ring abuts against the pressure receiving face formed on the pipe, and the pressure receiving face is pressed in the insertion direction by the annular edge.
  • the tertiary seal urging face formed on the pipe is pressingly contacted with the tertiary seal receiving face of the tip end of the pipe receiving port, and a seal contact pressure in the axial direction is generated in the pressingly contacting area (tertiary sealing portion).
  • the sealing performance due to the tertiary sealing portion is tertiarily ensured. This serves to ensure the sealing portion in triplicate.
  • a distance in a radial direction between the secondary seal inner and outer receiving faces is set to be 60 to 99%, preferably, 70 to 90% of a thickness of the projected cylindrical portion which coincides with a distance in a radial direction between the secondary seal inner and outer urging faces.
  • the projected portion of the inner ring can be pressingly inserted into the annular groove of the joint body, only by fastening the pressing ring and without using a dedicated jig or a special jig. Therefore, the workability of the connecting operation is enhanced.
  • a diameter of the secondary seal outer receiving face is indicated by OR1
  • a diameter of the secondary seal inner receiving face is indicated by OR2
  • a diameter of the secondary seal outer urging face is indicated by UR1
  • a diameter of the secondary seal inner urging face is indicated by UR2
  • the tip end of the projected cylindrical portion is chamfered in a tapered shape, and a width of a tip end face of the projected cylindrical portion is smaller than the distance in a radial direction between the secondary seal inner and outer receiving faces.
  • the projected cylindrical portion of the inner ring can be easily pressingly inserted into the annular groove of the joint body. Even when the seal contact pressure in a radial direction of the secondary sealing portion is increased so that the sealing performance is highly exerted, therefore, the projected cylindrical portion of the inner ring can be pressingly inserted into the annular groove of the joint body easily and smoothly.
  • the pipe joint made of resin of the invention means not only an independent pipe joint made of resin, but also a pipe joint made of resin in which the joint body is integrated with a fluid apparatus.
  • the illustrated pipe joint made of resin comprises a cylindrical joint body 1, a cylindrical inner ring 3, and a cap nut-like pressing ring 5.
  • the joint body 1, the inner ring 3, and the pressing ring 5 are independently molded into one body by synthetic resin having excellent chemical resistance and heat resistance, such as PFA (perfluoroalkoxyfluoro plastics), PTFE (polytetrafluoroethylene), ETFE (ethylene-trifluoro-ethylene), CTFE (chloro-trifluoro-ethylene), or ECTFE (ethylene-chloro-trifluoro-ethylene).
  • the joint body 1 comprises a cylindrical pipe receiving port 11 at least one end in the axial direction, and a short cylindrical portion 12 which is coaxial with the pipe receiving port 11 and projected into the pipe receiving port 11.
  • a primary seal receiving face 13 which is formed in a flaringly tapered manner is disposed on an inner peripheral portion of a tip end of the cylindrical portion 12.
  • An annular groove 14 is formed between the pipe receiving port 11 and the cylindrical portion 12.
  • the small-diameter wall face of the annular groove 14 forms a secondary seal inner receiving face 15, and the large-diameter wall face of the annular groove forms a secondary seal outer receiving face 16.
  • a tertiary seal receiving face 17 which is flaringly tapered is formed at a tip end of the pipe receiving port 11 so as to be coaxial with the pipe receiving port 11.
  • An external thread portion 18 is formed on the outer peripheral portion of the pipe receiving port 11.
  • the inner ring 3 is formed so as to have an inner diameter which is equal to the inner diameters of a pipe made of synthetic resin 7 and the joint body 1.
  • the inner ring 3 comprises a connecting portion 31 which is pressingly inserted into one end of the pipe made of synthetic resin 7 to be connected thereto, and a projected portion 32 which, when the connecting portion 31 is connected to the one end of the pipe 7, is projected from the one end of the pipe 7.
  • the connecting portion 31 of the inner ring 3 comprises a bulge portion 33 having a mountain-like section shape.
  • a tapered primary seal urging face 34 is formed on an inner peripheral portion of a tip end of the projected portion 32.
  • a projected cylindrical portion 35 which is formed by synthetic resin integrally with an outer peripheral portion of the tip end of the projected portion 32 is projected in the axial direction.
  • the inner peripheral face of the projected cylindrical portion 35 serves as a secondary seal inner urging face 36, and the outer peripheral face as a secondary seal outer urging face 37.
  • the primary seal urging face 34 can be pressingly contacted with the primary seal receiving face 13, and the projected cylindrical portion 35 can be pressingly inserted into the annular groove 14.
  • the inner ring 3 can be inserted into the pipe receiving port.
  • the pressing ring 5 comprises an internal thread portion 52 on an inner peripheral portion of an outer ring section 51.
  • An inner flange-like pressing piece 53 is continuously integrated with the outer end of the outer ring section 51.
  • An annular edge 54 is formed at the inner end on the side of the inner periphery of the pressing piece 53.
  • the inner diameter of the inner flange-like pressing piece 53 has a value which allows the pressing piece 53 to be fitted onto the pipe 7.
  • the inner diameter of the annular edge 54 is equal to or slightly larger than the diameter of a part of the pressure receiving face 72 where the diameter is smallest.
  • the distance W in a radial direction between the secondary seal inner and outer receiving faces 15 and 16 of the joint body 1 is set to be 60 to 99%, preferably, 70 to 90% of the thickness T of the projected cylindrical portion 35.
  • the thickness T of the projected cylindrical portion 35 coincides with the distance in a radial direction between the secondary seal inner and outer urging faces 36 and 37.
  • the distance W in a radial direction between the secondary seal inner and outer receiving faces 15 and 16 and the thickness T of the projected cylindrical portion 35 are set to have the above-mentioned mutual relationship, in either of the following three methods.
  • Fig. 3 shows the relationships defined by expression (1)
  • Fig. 6 the relationships defined by expression (2).
  • the tip end of the projected cylindrical portion 35 is chamfered in a tapered shape, so that the width T1 (see Fig. 6) of a tip end face of the projected cylindrical portion 35 is smaller than the distance W in a radial direction between the secondary seal inner and outer receiving faces 15 and 16.
  • the projected cylindrical portion 35 can be easily pressingly inserted between the receiving faces 15 and 16.
  • the face formed by chamfering the tip end of the projected cylindrical portion 35 is indicated by a reference numeral 38.
  • the projected portion 32 of the inner ring 3 connected to the pipe 7 is inserted into the pipe receiving port 11 of the joint body 1 as indicated by the arrow A of Fig. 3. Thereafter, the internal thread portion 52 of the pressing ring 5 which is previously fitted onto the pipe 7 is screwed on the external thread portion 18 of the pipe receiving port 11, and the pressing ring 5 is fastened. As indicated by the arrow B of Fig. 4, the projected cylindrical portion 35 of the inner ring 3 is gradually pressingly inserted into the annular groove 14 of the joint body 1. As shown in Fig. 5, the primary seal urging face 34 of the inner ring 3 is pressingly contacted with the primary seal receiving face 13 of the cylindrical portion 12, and, as shown in Figs. 1 and 2, the tertiary seal urging face 71 of the pipe 7 is pressingly contacted with the tertiary seal receiving face 17 of the pipe receiving port 11.
  • a primary sealing portion 10 is formed by the pressingly contacting area between the primary seal receiving face 13 and the primary seal urging face 34.
  • a secondary sealing portion 20 is formed by the pressingly contacting areas between the secondary seal outer receiving face 16 and the secondary seal outer urging face 37, and between the secondary seal inner receiving face 15 and the secondary seal inner urging face 36, and a tertiary sealing portion 30 is formed at the pressingly contacting area between the tertiary seal receiving face 17 and the tertiary seal urging face 71.
  • a seal contact pressure in the axial direction is generated so as to primarily and tertiarily ensure the sealing performance.
  • a seal contact pressure in a radial direction is generated so as to secondarily ensure the sealing performance.
  • the secondary sealing portion 20 elongates in the axial direction.
  • a seal contact pressure in the axial direction is generated in the primary and tertiary sealing portions 10 and 30, and a seal contact pressure in a radial direction is generated in the secondary sealing portion 20.
  • a sealing portion is formed in triplicate. Even when the sealing performance is impaired in one of the sealing portions, the other sealing areas maintain the required sealing performance. Even when temporal creep or stress relaxation is produced in the pressing ring 5, the pipe 7, or the like and the seal contact pressure in the axial direction of, for example, the primary sealing portion 10 is lowered, the seal contact pressure in a radial direction of the secondary sealing portion 20 is not lowered.
  • the sealing property of the secondary sealing portion 20 is independent of the degree of the fastening force of the pressing ring 5. Even when the fastening force of the pressing ring 5 is not strictly set in a connecting operation, therefore, an excellent sealing performance can be exerted. Consequently, high skill and experience are not required in a connecting operation.
  • the primary seal receiving face 13 which is formed in a flaringly tapered manner on the inner peripheral portion of the tip end of the cylindrical portion 12 of the joint body 1 overlaps with the primary seal urging face 34 of the inner ring 3, from the outer side in a radial direction. Even when the cylindrical portion 12 is affected by the press insertion of the projected cylindrical portion 35 into the annular groove 14 and disposed to be deformed in a falling manner in a diameter-reducing direction, therefore, the force causing the deformation of the cylindrical portion 12 serves to increase the pressingly contacting force exerted between the primary seal receiving face 13 and the primary seal urging face 34, and the sealing property of the primary sealing portion 10 is improved.
  • the force causing the deformation of the cylindrical portion 12 is received by the primary seal urging face 34, so that the falling deformation in a diameter-reducing direction of the cylindrical portion 12 is prevented from occurring, whereby the sealing property of the secondary sealing portion 20 is prevented from being lowered.
  • the inner peripheral portion of the tip end of the connecting portion 31 of the inner ring 3 may be chamfered, so that a recess 39 surrounded by the inner peripheral portion of the tip end and the pipe 7 is formed.
  • the recess 39 can positively form a flow region for the fluid, whereby fluid stagnation is prevented from occurring.
  • a pipe joint can be preferably used as a pipe joint for a liquid having high purity or ultrapure water.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Joints With Pressure Members (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Joints With Sleeves (AREA)

Claims (12)

  1. Eine aus einem Harz bestehende Rohrverbindung mit:
    einem Anschlussteil (1), welcher aus einem Kunstharz besteht und welcher an einem Ende eine zylindrische Rohraufnahme (11) aufweist;
    einen zylindrischen Bereich (12), welcher an dem Anschlussteil angebracht ist und welcher konzentrisch in die Rohraufnahme (11) hineinragt;
    eine erste Dichtfläche (13), welche konisch an einem inneren Umfangsbereich des Kopfendes des zylindrischen Bereichs angeordnet ist;
    zweite innere und äußere Wandflächen (15,16), wobei die zweite innere Wandfläche von einer Wandfläche geringen Durchmessers einer ringförmigen Vertiefung (14) gebildet ist, welche zwischen der Rohraufnahme (11) und dem zylindrischen Bereich (12) angeordnet ist, und wobei die zweite äußere Wandfläche (16) von einer Wandfläche großen Durchmessers der ringförmigen Vertiefung gebildet ist;
    einem zwischenringartigen aus Kunstharz bestehenden Keilring (3), welcher einen Verbindungsbereich (31) und einen Randbereich (32) aufweist, der in die Rohraufnahme (11) einführbar ist, wobei der Verbindungsbereich (31) in das Ende des aus einem Kunstharz bestehenden Rohres eingepresst wird, um es mit diesem Ende zu verbinden und wobei der Randbereich (32) über das Ende des Rohres hervorsteht, wenn der Verbindungsbereich (31) mit dem Ende des Rohres verbunden ist;
    eine erste Dichtfläche (34), welche konisch an einem inneren Randbereich eines Kopfendes des hervorstehenden Bereiches (32) des Keilringes (3) angeordnet ist und welche mit der ersten Dichtgegenfläche (13) druckverbunden ist;
    einen vorstehenden zylindrischen Bereich (35), welcher von einem äußeren Umfangsbereich des Kopfendes des vorstehenden Bereiches des Keilringes vorsteht und welcher in die ringförmige Vertiefung (14) einpressbar ist;
    zweite innere und äußere Wandflächen (36,37), wobei die zweite innere Wandfläche von einer inneren Wandfläche des vorstehenden zylindrischen Bereiches (35) gebildet ist und mit der zweiten inneren Wandfläche druckverbunden ist, und wobei die zweite äußere Wandfläche von einer äußeren Wandfläche des vorstehenden zylindrischen Bereiches gebildet ist und mit der zweiten äußeren Wandfläche (15) druckverbunden ist;
    eine Überwurfmutter (5), welche auf die Rohraufnahme (11) des Anschlussteiles (1) aufschraubbar ist; und
    einen Klemmflansch (53), welcher an der Überwurfmutter (5) angebracht ist und welcher beim Aufschrauben der Überwurfmutter auf die Rohraufnahme (11) eine Druckkraft in Richtung auf den Keilring (3) ausübt, welcher mit dem Ende des Kunstharzrohres verbunden und in die Rohraufnahme (11) eingeschoben ist.
  2. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 1,
    wobei der Verbindungsbereich (31) des Keilringes (3) eine Ausbuchtung (33) mit einer buckelartigen Querschnittsform aufweist und welche den Durchmesser des Rohres (7), in welches der Verbindungsbereich (31) eingepresst ist, vergrößert, wodurch eine dritte Dichtfläche (71) und eine Druckaufnahmefläche (72) an einer äußeren Umfangsfläche des Rohres (7) entsteht;
    wobei die dritte Dichtfläche (71) eine konische Form aufweist, bei der sich der Durchmesser in Richtung des vorderen Endes des Rohres (7) verringert, die Druckaufnahmefläche (72) eine konische Form aufweist, bei der sich der Durchmesser in Richtung des vorderen Endes des Rohres vergrößert, und wobei die dritte Dichtfläche (17), welche in einer sich konisch erweiternden Form am vorderen Ende der Rohraufnahme (11) gebildet ist und mit der die dritte Dichtfläche (71) druckverbunden ist; und
    wobei ein inneres umfängliches Ende (54) eines Klemmflansches (53) als ringförmige Kante ausgebildet ist, welche an der Druckaufnahmefläche (72) anliegt und eine Andruckkraft in Einsteckrichtung auf die Druckaufnahmefläche ausübt.
  3. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 1,
    wobei ein Abstand w in einer radialen Richtung zwischen den inneren und äußeren Dichtflächen (15, 16) mit 60 bis 99 % einer Dicke des vorstehenden zylindrischen Bereiches (35) vorgegeben ist, welcher mit einem Abstand in radialer Richtung zwischen der zweiten inneren und äußeren Wandfläche (36, 37) übereinstimmt.
  4. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 1,
    wobei ein Abstand (w) in einer radialen Richtung zwischen den inneren und äußeren Dichtflächen (15, 16) mit 70 bis 90 % einer Dicke des vorstehenden zylindrischen Bereiches (35) vorgegeben ist, welcher mit einem Abstand in radialer Richtung zwischen der zweiten inneren und äußeren Wandfläche (36, 37) übereinstimmt.
  5. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 3, bei der Verhältnisse bestehen, welche durch: UR1 = OR1 und UR2 < OR2 definiert sind, wobei ein Durchmesser der zweiten äußeren Dichtfläche (16) durch OR1 gekennzeichnet ist, ein Durchmesser der zweiten inneren Dichtfläche (15) durch OR2 gekennzeichnet ist, ein Durchmesser der zweiten äußeren Wandfläche (37) durch UR1 und ein Durchmesser der zweiten inneren Wandfläche (36) durch UR2 gekennzeichnet ist.
  6. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 4, bei der Verhältnisse bestehen, welche durch: UR1 = OR1 und UR2 < OR2 definiert sind, wobei ein Durchmesser der zweiten äußeren Dichtfläche (16) durch OR1 gekennzeichnet ist, ein Durchmesser der zweiten inneren Dichtfläche (15) durch OR2 gekennzeichnet ist, ein Durchmesser der zweiten äußeren Wandfläche (37) durch UR1 und ein Durchmesser der zweiten inneren Wandfläche (36) durch UR2 gekennzeichnet ist.
  7. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 3, bei der Verhältnisse bestehen, welche durch: UR1 > OR1 und UR2 = OR2 definiert sind, wobei ein Durchmesser der zweiten äußeren Dichtfläche (16) durch OR1 gekennzeichnet ist, ein Durchmesser der zweiten inneren Dichtfläche (15) durch OR2 gekennzeichnet ist, ein Durchmesser der zweiten äußeren Wandfläche (37) durch UR1 und ein Durchmesser der zweiten inneren Wandfläche (36) durch UR2 gekennzeichnet ist.
  8. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 4, bei der Verhältnisse bestehen, welche durch: UR1 > OR1 und UR2 = OR2 definiert sind, wobei ein Durchmesser der zweiten äußeren Dichtfläche (16) durch OR1 gekennzeichnet ist, ein Durchmesser der zweiten inneren Dichtfläche (15) durch OR2 gekennzeichnet ist, ein Durchmesser der zweiten äußeren Wandfläche (37) durch UR1 und ein Durchmesser der zweiten inneren Wandfläche (36) durch UR2 gekennzeichnet ist.
  9. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 3, bei der Verhältnisse bestehen, welche durch: UR1 > OR1 und UR2 < OR2 definiert sind, wobei ein Durchmesser der zweiten äußeren Dichtfläche (16) durch OR1 gekennzeichnet ist, ein Durchmesser der zweiten inneren Dichtfläche (15) durch OR2 gekennzeichnet ist, ein Durchmesser der zweiten äußeren Wandfläche (37) durch UR1 und ein Durchmesser der zweiten inneren Wandfläche (36) durch UR2 gekennzeichnet ist.
  10. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 4, bei der Verhältnisse bestehen, welche durch: UR1 > OR1 und UR2 < OR2 definiert sind, wobei ein Durchmesser der zweiten äußeren Dichtfläche (16) durch OR1 gekennzeichnet ist, ein Durchmesser der zweiten inneren Dichtfläche (15) durch OR2 gekennzeichnet ist, ein Durchmesser der zweiten äußeren Wandfläche (37) durch UR1 und ein Durchmesser der zweiten inneren Wandfläche (36) durch UR2 gekennzeichnet ist.
  11. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 3, wobei das vordere Ende des vorstehenden zylindrischen Bereiches (35) konusförmig angefast ist und die Breite einer Stirnfläche des zylindrischen Bereiches (35) kleiner als der Abstand in radialer Richtung zwischen der zweiten inneren und äußeren Dichtfläche (15, 16) ist.
  12. Eine aus Harz bestehende Rohrverbindung gemäß Anspruch 4, wobei das vordere Ende des vorstehenden zylindrischen Bereiches (35) konusförmig angefast ist und die Breite einer Stirnfläche des zylindrischen Bereiches (35) kleiner als der Abstand in radialer Richtung zwischen der zweiten inneren und äußeren Dichtfläche (15, 16) ist.
EP97112652A 1996-08-09 1997-07-23 Rohrkupplung aus synthetischem Harz Expired - Lifetime EP0823578B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP211385/96 1996-08-09
JP21138596 1996-08-09
JP8211385A JP2799562B2 (ja) 1996-08-09 1996-08-09 樹脂製管継手

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EP0823578A2 EP0823578A2 (de) 1998-02-11
EP0823578A3 EP0823578A3 (de) 1999-07-07
EP0823578B1 true EP0823578B1 (de) 2004-01-28

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EP (1) EP0823578B1 (de)
JP (1) JP2799562B2 (de)
KR (1) KR100249005B1 (de)
AT (1) ATE258663T1 (de)
DE (1) DE69727342T2 (de)
TW (1) TW351745B (de)

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Also Published As

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KR19980018537A (ko) 1998-06-05
EP0823578A3 (de) 1999-07-07
KR100249005B1 (ko) 2000-04-01
US5743572A (en) 1998-04-28
JP2799562B2 (ja) 1998-09-17
JPH1054489A (ja) 1998-02-24
EP0823578A2 (de) 1998-02-11
DE69727342T2 (de) 2005-01-20
DE69727342D1 (de) 2004-03-04
TW351745B (en) 1999-02-01
ATE258663T1 (de) 2004-02-15

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